Electrolysis of an aqueous solution of sodium hydroxide between platinum electrodes yields :

hydrogen at cathode and oxygen at anode

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hydrogen at anode and oxygen at cathode

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only hydrogen at cathode

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only oxygen at anode

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Solution

The correct option is A hydrogen at cathode and oxygen at anode
Reduction potential of $H^{+}$ > Reduction potential of $N a^{+}$
$∴ H^{+}$ gets reduced at the cathode to $H_{2}$
and $O H^{-}$ gets oxidized to $O_{2}$ at anode.

Option A is correct.

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Which of the following statements are correct?

a) The electrolysis of aqueous NaCl produces hydrogen gas at the cathode and chlorine gas at the anode .

b) The electrolysis of a $C u S O_{4}$ solution using Pt electrodes causes the liberation of $O_{2}$ at the anode and the deposition of copper at the cathode .

c) Oxygen and hydrogen are produced at the anode and cathode during the electrolysis of dilute aqueous solution of $H_{2} S O_{4}$ .

d) All electrolytic reactions are redox reactions .

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Electrolysis of an aqueous solution of sodium hydroxide between platinum electrodes yields :

The correct option is A hydrogen at cathode and oxygen at anodeReduction potential of H+ > Reduction potential of Na+∴H+ gets reduced at the cathode to H2and OH− gets oxidized to O2 at anode.Option A is correct.

The correct option is A hydrogen at cathode and oxygen at anode
Reduction potential of $H^{+}$ > Reduction potential of $N a^{+}$
$∴ H^{+}$ gets reduced at the cathode to $H_{2}$
and $O H^{-}$ gets oxidized to $O_{2}$ at anode.

Option A is correct.